"throw a game" This goes completely against the basics of sport. IMO At all levels sportspeople should be playing to win, that is not to say "win at all costs" (thats for the professionals, refer the OZ cricket team) but it should be the first thing you learn, you do the best you can, all the time!
As for the idea that you will let in another tema that you "can" beat. If you teach players to lose, it wont be long before that team is another one you "cant" beat.
If your not playing to win, get off and let someone on who is.